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The origin of fat-tailed distributions in financial time series. (English) Zbl 1056.91057

Summary: A classic problem in physics is the origin of fat-tailed distributions generated by complex systems. We study the distributions of stock returns measured over different time lags \(\tau\). We find that destroying all correlations without changing the \(\tau=1 d\) distribution, by shuffling the order of the daily returns, causes the fat tails to almost vanish for \(\tau>1 d\). We argue that the fat tails are caused by the well-known long-range volatility correlations that have already been systematically studied previously. Indeed, destroying only sign correlations, by shuffling the order of only the signs (but not the absolute values) of the daily returns, allows the fat tails to persist for \(\tau>1 d\).

MSC:

91B84 Economic time series analysis
91B28 Finance etc. (MSC2000)
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References:

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